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temporal derainbowing filter

Bifrost is a temporal derainbowing filter created by Fredrik Mellbin.

The original Avisynth plugin (version 1.1) worked on the whole frame or not
at all. This version works on blocks, meaning that static parts of the
image can be processed even if something moves on screen.

The VapourSynth plugin will accept any 8 bit YUV formats. The Avisynth
plugin is still limited to YV12.